- scope = ntohl(scope);
- int scopeoffset = strlen(addr_buffer);
- int remain = *addr_buflen - scopeoffset;
- int r = snprintf(addr_buffer + scopeoffset, remain,
- "%%%"PRIu32"", scope);
- assert(r < *addr_buflen - scopeoffset);
- af_debug("printed scoped address `%s'", addr_buffer);
+ if (flags & adns_qf_addrlit_scope_forbid)
+ return EINVAL;
+ int scopeoffset = strlen(buffer);
+ int remain = *buflen_io - scopeoffset;
+ char *scopeptr = buffer + scopeoffset;
+ assert(remain >= IF_NAMESIZE+1/*%*/);
+ *scopeptr++= '%'; remain--;
+ bool parsedname = 0;
+ af_debug("will print scoped addr %s %% %"PRIu32"", buffer, scope);
+ if (scope <= UINT_MAX /* so we can pass it to if_indextoname */
+ && !(flags & adns_qf_addrlit_scope_numeric)
+ && addrtext_scope_use_ifname(sa)) {
+ parsedname = if_indextoname(scope, scopeptr);
+ if (!parsedname) {
+ af_debug("if_indextoname rejected scope (errno=%s)",
+ strerror(errno));
+ if (errno==ENXIO) {
+ /* fair enough, show it as a number then */
+ } else if (addrtext_our_errno(errno)) {
+ /* we use these for other purposes, urgh. */
+ perror("adns: adns_addr2text: if_indextoname"
+ " failed with unexpected error");
+ return EIO;
+ } else {
+ return errno;
+ }
+ }
+ }
+ if (!parsedname) {
+ int r = snprintf(scopeptr, remain,
+ "%"PRIu32"", scope);
+ assert(r < *buflen_io - scopeoffset);
+ }
+ af_debug("printed scoped addr `%s'", buffer);